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“What is the yardstick for measuring pollution?
It is called RSPM, or Respirable Suspended Particulate Matter, and is made up of dust, soot or smoke particles. Their tiny size makes it virtually impossible to filter them out. These solid and liquid particles are less than 10 microns in diameter. To put that in perspective, a strand of human hair is between 50 and 70 microns thick. RSPM is generally classified as PM10 (diameter 10-2.5 microns) and PM2.5 (under 2.5 microns).” Article explains sources of chemical pollutants, why they are harmful, and more. Nation. Read it on

Explained: Know your toxins